Twelve-year-old Theophilus Grey - Philo to his friends - is a linkboy in eighteenth-century London, guiding people home through the dark, dangerous alleys by the light of his torch. But in secret, he's also a spy gathering information for his master, the mysterious Garnet Hooke...When thieves and rogues start dropping without a scratch, rumours spread of a dangerous faery demon on the loose, and Philo begins to fear the worst. Could the rumours really be true? A sudden wave of crime sweeps the neighbourhood, and Philo can't help but wonder if the two are connected...With help from his new friend Mr Paxton, Philo finds himself battling a threat far more sinister than any he's faced before. He will need all of his cunning if he has any chance of uncovering the truth behind the demon thief in time to save his friends... Ages 13+